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https://issues.apache.org/jira/browse/TS-1375?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13423648#comment-13423648
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kuotai commented on TS-1375:
----------------------------
This bug is because of one or more net thread is in lock_wait state(because of
mutex is not unlock). So the hunged net thread will accept new event from
scheduler, but can't handle event. One new client will create one
connection(will create one event), but the connection havn't be processed(mean
close connection). Now, we have found one case in cluster, be testing more
about my patch. And I think every unlock mutex about connection maybe trigger
connection's throttling.
> too many connections, throttling
> --------------------------------
>
> Key: TS-1375
> URL: https://issues.apache.org/jira/browse/TS-1375
> Project: Traffic Server
> Issue Type: Bug
> Environment: centos 6.2 x86_64 ats from git(3.3.0)
> Reporter: bettydramit
> Assignee: kuotai
> Fix For: 3.3.1
>
>
> [Jul 20 09:09:19.787] Server {0x2ad5ddd00060} WARNING: too many open file
> descriptors, emergency throttling
> [Jul 20 09:09:19.788] Server {0x2ad5ded28700} WARNING: too many connections,
> throttling
> [Jul 20 09:19:19.823] Server {0x2ad5eb6d2700} WARNING: too many connections,
> throttling
> [Jul 20 09:19:22.634] Manager {0x7f10bc4327e0} NOTE: [Alarms::signalAlarm]
> Skipping Alarm: 'too many connections, throttling'
> [TrafficManager] ==> Cleaning up and reissuing signal #15
> [Jul 20 09:21:50.819] Manager {0x7f10bc4327e0} ERROR: [TrafficManager] ==>
> Cleaning up and reissuing signal #15
> [Jul 20 09:21:50.819] Manager {0x7f10bc4327e0} ERROR: (last system error 2:
> No such file or directory)
> NOTE: Traffic Server received Sig 15: Terminated
> [TrafficManager] ==> signal #15
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